(2+а4)(а8-2а4+4)+а10(1-а2)

Question

(2+а4)(а8-2а4+4)+а10(1-а2)

Answer 1

2а^8-4а^4+8+а^12-2а^8+4а^4+а^10-а^12=8+а^10

Answer 2

(2+а4)(а8-2а4+4)+а10(1-а2)=2а^8-4а^4+8+12а^12-2а^8+4а^4+а^10-а^12=8+а^10